Can two points on a face tell us whether someone is really opening their mouth? It sounds almost too simple. Yet behind this question lies an interesting intersection of computer vision, mathematics, and biometric security. In a new article for The Research Code, Hangga explores how facial contours can be converted into coordinates, how a simple Euclidean-distance calculation can turn those coordinates into an observable signal, and how that signal can contribute to a broader face-liveness workflow. But the mathematics is only part of the story. A distance measurement is not the same as proof of liveness. The article also examines the effects of face scale, head pose, image quality, individual variation, thresholds, and potential replay or manipulated presentations. The broader lesson is important: a mathematically correct measurement can still have significant limitations when applied to a real-world security problem. Read the full article and explore how two points → one distance → one decision can become a useful example of mathematical reasoning in computer vision and security. #ComputerVision #Mathematics #Biometrics #AI #Cybersecurity #MachineLearning #Research #ScienceCommunication

Value Creation 💐

🌧️ Why rain feels so good (the science behind it) Ever stepped outside after rain or stood near a waterfall and felt instantly calmer and happier? There’s real physics (and a bit of biology) behind that feeling. The Lenard Effect: When water droplets splash, collide, or break apart — whether it’s rain hitting the ground, waves crashing, or water tumbling down a waterfall — they create "negative ions" in the air. This is called the "Lenard effect" (discovered in 1892). The splashing separates electrical charges, releasing clusters of negatively charged oxygen molecules into the surrounding air. These negative ions are naturally abundant near: - Waterfalls - Beaches and breaking waves - Rivers and moving water - Even regular rainfall (especially when drops hit surfaces) Do negative ions actually affect mood? Research suggests they can. A 2013 meta-analysis found that exposure to high levels of negative ions was linked to reduced symptoms of depression — particularly in people with seasonal affective disorder. The effect was stronger with higher concentrations of ions. While the exact mechanism isn’t fully settled, one popular explanation (popularized in certain health communities) involves the lungs. Negative ions may support the breakdown of serotonin there, which some researchers link to feelings of calm and reduced stress. Even without perfect consensus on the “why,” people consistently report feeling refreshed in these high-negative-ion environments. Part of it is probably the ions, part is the fresh air, cooler temperatures, and the simple joy of being in nature. Why do kids (and many adults) love getting caught in the rain? It’s not just “because negative ions.” Rain is: - Sensory-rich (sound, touch, smell) - Novel and playful - Often cooling on a warm day The combination of the physical sensation + any mood-lifting effects from the ions can make it genuinely uplifting. Want to try it? Next time it rains: - Step outside for a few minutes - Feel the drops on your skin or hands - Or just open a window and breathe the post-rain air You don’t need to get completely soaked — even brief exposure to natural negative ions can feel surprisingly good. Nature has been giving us this free “mood boost” for millions of years. Sometimes the simplest things really are backed by science. 🌿 (Pro tip: Waterfalls are basically negative-ion factories — if you ever get the chance to stand near one, do it.)

The "Three Gorges Dam" is the world’s largest hydropower project — a 2.3 km long, 181 m high concrete gravity dam on China’s Yangtze River. Built between 1994 and 2006 (full power in 2012), it holds back a reservoir stretching ~600+ km. It has 22,500 MW installed capacity and generates roughly 90-100+ TWh of electricity per year on average. What it actually delivered - Massive clean electricity that reduced some coal use. - Improved navigation — big ships can now travel much farther inland, cutting transport costs inside China. - Flood control that has worked during several major events, protecting downstream areas in those specific cases. - A huge engineering flex that boosted China’s image and industrial capacity. These benefits are real. The dam produces renewable power at scale and moves goods more efficiently on the river. The real costs (the part often downplayed) Over 1.3 million people were forcibly relocated. Many lost farmland, homes, and communities. Compensation was frequently inadequate or corrupt; plenty ended up worse off economically and socially. This was not a gentle process — it was state-forced displacement on a massive scale. The local environment took a permanent hit: - The baiji (Yangtze river dolphin) is functionally extinct. - Fish stocks collapsed in the affected stretch. - The reservoir created stagnant water that increased pollution and algae issues in places. - Landslides increased around the new lake. - Small earthquakes became more frequent due to the weight of the water (induced seismicity). - Silt now builds up behind the dam instead of flowing downstream, worsening erosion and riverbed changes further along. These are documented effects, not speculation. The unique Three Gorges ecosystem was sacrificed. If the dam had never been built China would have faced more frequent and severe floods in some years — the Yangtze has a deadly history of them. That’s a legitimate downside. However: - Over a million people would have stayed in their homes and kept their land. - The river would not have been turned into this giant, altered reservoir with its specific ecological damage. - China would have relied more on coal (or other sources) for power in the early years, increasing local air pollution and global emissions somewhat. - Inland shipping would have stayed slower and costlier. The dam was a deliberate choice by Chinese leadership to prioritize rapid development, flood risk reduction, and control over nature. They accepted the human and ecological price tag. Economy and global supply chains The dam helped keep some Chinese manufacturing and transport costs lower, which indirectly supported cheaper exports to the rest of the world. Navigation improvements were meaningful for domestic trade. But this is secondary. China would still dominate global manufacturing without this one project. Worldwide supply chain impacts from the dam’s existence (or absence) are modest compared to trade policies, pandemics, or geopolitics. The main winners were Chinese industry and the state. Global consumers got slightly cheaper goods as a byproduct. The “shifting/cracking” and Earth rotation claims — fact-checked The dam is not falling apart or dangerously shifting. There are normal hairline cracks in any structure this size. During extreme 2020 floods, some outer/peripheral parts deformed slightly under pressure — this was publicly acknowledged by operators and is considered within safe limits. It is monitored. Viral videos claiming imminent collapse are exaggerated clickbait. (Current aerial view of the dam and reservoir + 1987 vs 2006 satellite comparison showing the scale of change.)

A decade ago, seeing was believing. Today, a photo, video, or even a voice recording may be completely fake. The scientist who helped create modern digital forensics says we're entering a world where AI-generated deception is becoming indistinguishable from reality—and humans are surprisingly bad at spotting it. The next digital skill won't be creating content. It will be verifying what's real. 🧠🔍 Source: Kai Kupferschmidt, Science (2026) — featuring digital forensics pioneer Hany Farid

One sentence can change the way you see success. A struggling Ph.D. student finally opened up to his supervisor after months of self-doubt. The response? “You are here to learn to ride a bicycle, not to invent a bicycle.” Too many people judge themselves for not being experts while they're still learning. The goal isn't to be extraordinary on day one. The goal is to keep pedaling. 🚲 Source: Ehsan Hamzehpoor, Science (2025)

For decades, robots were designed to look like animals. Then scientists asked a different question: What if a robot didn't need a front, back, left, or right side at all? The result is Argus — a 20-legged robot that can move in almost any direction, recover from impacts, keep operating after losing limbs, and navigate terrain that challenges conventional robots. 🤖 The future of robotics may not be inspired by biology. It may be inspired by mathematics. Source: Science Robotics (2026), DOI: 10.1126/scirobotics.aec1725

A bumblebee just challenged one of science's biggest assumptions. 🐝 Researchers gave bees a completely new problem: Move a ball beneath an out-of-reach flower to get a reward. No training. No demonstration. No prior experience. More than 70% figured it out. For decades, spontaneous problem-solving was considered a hallmark of large-brained animals like chimpanzees and crows. Now, a brain smaller than a grain of rice has entered the conversation. Source: Bhambore et al., Science (2026), DOI: 10.1126/science.ady1618 What other animals are smarter than we give them credit for?